plc外文翻譯---plc在應(yīng)用中應(yīng)注意的問(wèn)題-plc設(shè)計(jì)-在線瀏覽
2025-03-24 06:45本頁(yè)面
【正文】 will connect output element39。s size, will affect relay39。s after flow guarantees protects, the exchange output anti acmodates the absorbing circuit, the transistor and the bidirectional thruster output bypassed resistor protection. Third, outside security electric circuit to guarantee that the overall system can under the secure state the reliable work, avoids, because the external power supply breaks down, PLC to present the heavy economic loss which and the person casualty exceptionally, the disoperation as well as outputs by mistake creates, PLC the outside should install the essential protection circuit. (1) Stops the electric circuit anxiously. Regarding can cause the user to cause the damage the dangerous load, besides performs in the control procedure to consider, but also exterior should design the emergency stop electric circuit, causes when PLC breaks down, can cause the injury load power source reliably to shut off. (2)Fragment. The forward and reverse revolution and so on reversible operation39。 the reciprocation moves and rises and falls motion the control system, must establish the exterior spacing protection circuit. (3)The programmable controller has selfchecking functions and so on surveillance timer, when inspects exceptionally, outputs pletely the closure. But when programmable controller CPU breakdown cannot control the output, therefore, regarding can cause the user to cause the damage the dangerous load, to guarantee that the equipment moves under the secure state, must design the external circuit to protect. (4) Power source load protection. If the PLC power source breaks down, the interruption interval is short in 10 seconds, PLC works not affected, if the power source interrupt surpasses 10 second or the power source drops surpasses the permissible value, then the PLC stop work, all output also separates。s input device. (5) Significant breakdown warning and protection. Regarding easy to have heavy accident39。s ground terminal docking, meets the grounding the crosssectional area should not to be smaller than 2mm2, the earth resistance is smaller th
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